Carl rumpff



V UNITED STATES PATENT OFFICE. I

CARL RUMPFF, OF APRATH, NEAR ELBERFELD, PRUSSIA, GERMANY.

MANUFACTURE OF DYEI-STUFF ORCOLORlNG-MATTER.

SPECIFICATION forming part of Letters Patent Iva 256,377, dated. April 11,1882.

- Application filed January 9, 1882 (N0 specimens.)

To all whom it may concern:

Be it known that I, CARL RUMPFF, residing at Aprath, near Elberfeld, in the Kingdom of of its sodium salt, are described in my application for patent filed April 8, 1881.

I prepare my new dye-stud as follows: I dis- I solve one hundred kilograms of finely-powdered amido-beta-naphthaline-monosulphonic acid in one thousand liters of water. To this solution I add seventy-five kilograms of hydrochloric acid of 21 Baum. I cool the mixture so prepared to from 3 centigradc to 6 centigrade, and then pourinto it slowly asolution oftwentyfive kilograms of sodium nitrite in one hundred kilograms of water. The mixture is now left at-restforscveral hours, when thedesired chemical reaction will be completed-that is to say, the amido-betanaphthaline monosulphonic acid will be transformed into the diazo-betanaphthaline-monosulphonic acid. In the next operation I slowly pour the mixture containing the diazo beta naphthalinemonosulphonic acid into a solution of one hundred and fifty kilograms of the sodium salt of my alpha-monosulphonic acid of beta -napbthol (crystallized from an alcohol solution) in one hundred kilograms of ammonia of ten per cent. strength. My new coloring-matter is the result of the reaction of the substances in solution. The following equation exhibits the changes more specifically:

Diazo-beta-naphtha- Sodium salt of line monosulplionic alpha-monosulacid. lionic acid of eta-napl1thol. I T I II CMH5 gglaNa+NacL -w- New coloring-matter.

The new dye-stuff is to be precipitated out. of its solutionby common salt and purified by crystallization from water.

I claim As a new product, the dye-stuff or coloringmatter which results from the reaction ofdiazobeta-naphthaline-monosulphonic acid with the sodium salt of the alpha-mouosulphonic acid of bcta-naphthol, substantially as described.

CARL RUMPFF. Witnesses:

J. FERD. KEDENBURG, FR. N. SonULTER. 

